Badicu, G., Gatterer, H., Balint, L. and Burtscher, M. (2018) “The effects of weekly motivational phone calls on the amount of leisure sports activities and changes in physical fitness”, Pedagogics, psychology, medical-biological problems of physical training and sports, 22(5), pp. 226–230. doi: 10.15561/18189172.2018.0501.